Creating the Fluffiest Yogurt Cloud Cake is a straightforward process that yields fantastic results. Follow these steps carefully:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
2. Mix Wet Ingredients: In a large bowl, combine the yogurt, granulated sugar, egg yolks, vegetable oil, and vanilla extract. Whisk until smooth and well incorporated.
3. Combine Dry Ingredients: In another bowl, sift together the flour, baking powder, baking soda, and salt.
4. Mix Together: Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Be careful not to overmix.
5. Whip Egg Whites: In a separate bowl, beat the egg whites until stiff peaks form. This is crucial for achieving the cake’s fluffiness.
6. Fold in Egg Whites: Gently fold the whipped egg whites into the batter. Start with a small amount to lighten the mixture, then gradually add the rest. Be gentle to maintain the volume.
7. Bake: Pour the batter into the prepared cake pan. Bake in the preheated oven for 30-35 minutes or until a toothpick inserted into the center comes out clean.
8. Cool the Cake: Remove the cake from the oven and let it cool in the pan for about 15 minutes. Then, transfer it to a wire rack to cool completely.

This simple process will lead you to a cake that is not only delicious but also visually stunning!